What year are the boards? The 2010 Faction is different than prior years. Most people say the new version is better, I actually rode the 2008 version for a year and really liked it. For a continuous board it had great pop and was just a smooth overall ride. Sorry, can't help on the Groove, you don't hear a ton about that board.

I have an 08 Faction that I really like, and I also have a LF Fish which from what I have seen, seems to have some similar bottom features as the Groove. Both are great boards. I have really been wanting to try the Groove and also the 10 Faction.